libyaml-dirを指定しないとエラーが発生。
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
\curl -L https://get.rvm.io | bash -s stable rvm pkg install libyaml rvm install ruby-1.9.3 --with-libyaml-dir=$rvm_path/usr
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